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County ZIP codes · Iowa · FIPS 19107

Keokuk County, IA ZIP Codes

Keokuk County, Iowa has 20 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026), all residential. 14 of the residential ones lie mainly in Keokuk County and 6 mainly in a neighboring county; 14 cross the county line. Median household income ranges from $60,768 in 52316 (North English) to $98,438 in 52563 (Hedrick) (Census Bureau, ACS 2020-2024).

  • ACS2020-24
  • Census2020

Where are the ZIP codes of Keokuk County?

50104 · Gibson: $56k50136 · Keswick: $76k50255 · Thornburg: $40k50268 · What Cheer: $59k52231 · Harper: $91k52248 · Keota: $77k52316 · North English: $61k52335 · South English: $52k52355 · Webster: $64k52356 · Wellman: $57k52550 · Delta: $58k52561 · Fremont: $76k52562 · Hayesville: –52563 · Hedrick: $98k52568 · Martinsburg: $44k52576 · Ollie: $64k52580 · Packwood: $53k52585 · Richland: $76k52586 · Rose Hill: $53k52591 · Sigourney: $62k522485259152563523565231650268525855258652576523355235552231525805256152550501365010450104 · Gibson: $56k50136 · Keswick: $76k50255 · Thornburg: $40k50268 · What Cheer: $59k52231 · Harper: $91k52248 · Keota: $77k52316 · North English: $61k52335 · South English: $52k52355 · Webster: $64k52356 · Wellman: $57k52550 · Delta: $58k52561 · Fremont: $76k52562 · Hayesville: –52563 · Hedrick: $98k52568 · Martinsburg: $44k52576 · Ollie: $64k52580 · Packwood: $53k52585 · Richland: $76k52586 · Rose Hill: $53k52591 · Sigourney: $62k522485259152563523565231650268525855258652576523355235552231525805256152550501365010450104 · Gibson: $56k50136 · Keswick: $76k50255 · Thornburg: $40k50268 · What Cheer: $59k52231 · Harper: $91k52248 · Keota: $77k52316 · North English: $61k52335 · South English: $52k52355 · Webster: $64k52356 · Wellman: $57k52550 · Delta: $58k52561 · Fremont: $76k52562 · Hayesville: –52563 · Hedrick: $98k52568 · Martinsburg: $44k52576 · Ollie: $64k52580 · Packwood: $53k52585 · Richland: $76k52586 · Rose Hill: $53k52591 · Sigourney: $62k5224852591525635235652316502685258552586525765233552355522315258052561
The residential ZIP codes of Keokuk County (whole outlines, including the parts in neighboring counties), shaded by median household income in national fifths (ACS 2020-2024). <$54.1k$98.1k+no figure

Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).

How different are its ZIP codes?

The middle half of its ranked ZIP codes (1,000+ people living in households) report median household incomes between $62,404 and $77,174.

They carry 20 postal town names.

Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).

All 20 residential ZIP codes in Keokuk County

14 ZIP codes lie mainly in Keokuk County; 6 more reach into it from a neighboring county and follow the first table.

Residential ZIP codes mainly in Keokuk County, largest first; "In this county" is the share of the ZIP's land in the county
In this county
52591 Sigourney 2,721 22 $62k $157k 100%
52563 Hedrick 1,602 15 $98k $130k 58%
50268 What Cheer 908 20 $59k $77k 82%
52585 Richland 838 15 $76k $142k 60%
52335 South English 644 13 $52k $106k 100%
52550 Delta 552 14 $58k $110k 98%
52231 Harper 539 16 $91k $242k 100%
50136 Keswick 376 9 $76k $98k 94%
52576 Ollie 371 8 $64k $120k 99%
52355 Webster 283 8 $64k $110k 92%
50104 Gibson 103 7 $56k $190k 64%
52568 Martinsburg 80 305 $44k $66k 100%
52562 Hayesville 52 275 – $69k 100%
50255 Thornburg 51 267 $40k – 100%

Partly in Keokuk County

Residential ZIP codes mainly in another county that reach at least 1% into Keokuk County, by their share here
In this county
52248 Keota 1,675 15 $77k $157k 48%
52561 Fremont 1,112 30 $76k $123k 16%
52316 North English 1,597 22 $61k $151k 13%
52586 Rose Hill 600 13 $53k $105k 3%
52580 Packwood 711 18 $53k $116k 2%
52356 Wellman 2,664 28 $57k $228k 1%

Download the 20 ZIP codes as CSV

Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; county shares by land area (Census 2020 ZCTA-county relationship file).

Which ZIP codes cross the county line?

14 ZIP codes of Keokuk County extend into another county. A ZIP code follows mail routes, not county borders.

Share of each ZIP code's land in Keokuk County and in the neighboring counties
ZIPIn KeokukElsewhere
523561%Washington County 74%; Iowa County 17%; Johnson County 8%
5224848%Washington County 52%
5256358%Wapello County 38%; Jefferson County 3%
5231613%Iowa County 87%
5256116%Mahaska County 84%
5026882%Mahaska County 18%
5258560%Jefferson County 29%; Washington County 11%
525802%Jefferson County 98%
525863%Mahaska County 97%
5255098%Mahaska County 2%
5013694%Iowa County 6%
5257699%Jefferson County 1%
5235592%Iowa County 8%
5010464%Poweshiek County 26%; Mahaska County 10%

Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).

Which first three digits do Keokuk County's ZIP codes use?

The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Keokuk County's ZIP codes use 5 prefixes: 501, 502, 522, 523 and 525.

Three-digit prefixes of Keokuk County's ZIP codes, the sectional center for each (USPS labeling list L005, effective October 1, 2026) and how many of the prefix's codes are Keokuk County's
PrefixSectional centerHereAll codes
501 Des Moines, IA (SCF 500) 2 69
502 Des Moines, IA (SCF 500) 2 65
522 Cedar Rapids, IA (SCF 522) 2 50
523 Cedar Rapids, IA (SCF 522) 4 53
525 Des Moines, IA (SCF 500) 10 50

Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.